Paper cutting machine having a back gauge clamping means



Aug. 5, 1952 J, KERR 2,605,839

PAPER CUTTING MACHINE HAVING A BACK GAUGE CLAMPING MEANS Filed Aug. 28, 1947 INVENTOR JOHN KERR Patented Aug. 5, 1952 PAPER CUTTING MACHINE HAVING ABlioK ,GAUGE CLAMPING MEANS iohn Kerr,.Galt, Ontario, Canada I, ApplicationAugust 28, 1947, Serial No. 771,097

2 Claims. (01. 1e4-59 This invention relates to locking means for back gauges in paper cutting machines. y

The object of the invention is to provide a simple yet eifective locking means which will hold the back gauge firmly in the exact position at which it has been set by the operator. A further object is to provide a locking means which will normally look the back gauge and requires positive actuation to release the back gauge for adjustment. A further object is to provide means for automatically locking the back gauge when the cutting machine is put in operation.

These objects are attained by the locking means hereinafter described and illustrated, by way of example, in the annexed drawings in which:

Figure 1 is a diagrammatic front elevation of a cutting machine showing my novel locking means applied thereto in the unlocked position;

Figure 2 is a front elevation on a larger scale of the locking means in locked position and showing the lever which operates the cutting mechanism in operative position; and

Figure 3 is a front elevation showing the locking means in locked position and the lever which operates the cutting mechanism in inoperative position.

Referring to the drawings in which the same numbers refer to corresponding parts in the various figures, the paper cutting machine consists generally of a frame i, a bed or base plate 2, a cutting blade or guillotine 3 mounted on the frame and adapted to move in a plane substantially at righ angles to the surface of bed 2, and a back gauge 4 which slides on bed 2.

Back gauge 4 is employed to vary the width of paper or the like which is to becut by the machine. The actual mechanism whereby the back gauge is moved is not shown and is not important so far as this invention is concerned. It is suiiicient to say that a hand wheel 5, which is rotatable on a vertical axis, is turned so as to slide the back gauge to and from cutting blade 3. conventionally a lock has been used to lock the wheel in adjusted position to prevent the gauge from moving from the position at which it is set. In practice, however, the operator sometimes forgets to lock the wheel with the result that the gauge moves under the impact of the paper which is pushed against it and the size of the cut varies during the cutting operation.

A novel locking means is provided below bed 2. The locking means comprises a bracket 6,

secured to the lower front portion of frame I, on which an upper clamping lever 1 and a lower clamping lever 3 are pivotally mounted inter- Y 2 mediate of their ends. Clamping levers 1 and 8 are disposed horizontally and are adapted to clamp hand wheel 5 between them; as shown in Figures 2 and 3; To actuate these levers a toggle joint is provided which consists of two links 9 and I0. Link 9 is pivoted to one end of upper clamping lever 1 and link It is similarly pivoted to the corresponding end of lower clamping lever 8, the two links themselves being pivoted together.

An arm H is integrally connected to an extension ill of the link I0 and extends substantially parallel to the links when the links are in alignment and the hand wheel is looked as shown in Figures 2 and 3. To unlock the hand wheel, arm H is manually pressed outwardly and downwardly to the position shown in Figure 1, thereby breaking the toggle joint outwardly, to pivot clamping levers 1 and 8 and release them from engagement with hand wheel 5.

A lever i2, suitably mounted on frame I of the machine, is employed to operate the cutting mechanism. Figures 1 and 3 show lever [2 in normal or non-operative position. When lever I2 is pulled by the operator into operative position (as shown in Figure 2), arm H (and the locking means) is put into clamping (or looking) position, in which position arm ll will remain, constantly looking the hand wheel until released by an outward and downward pressure of the hand when the operator wishes to change the setting. It will be understoodthat the arm I I will remain in looking position unless and until it is desired to change the setting. The lever l2 may be actuated without affecting the locking mechanism. Therefore the lever l2 may be, and frequently will be in the non-operative position while the arm II will be in the locking position as shown in Fig. 3.

It is thought that the construction and use of the invention will be apparent from the above description of the various parts and their purpose. It is to be understood that the form of the invention herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of the invention or the scope of the subjoined claims.

What I claim as my invention is:

1. In a paper cutting machine having a cutting knife, a back gauge, a knife control lever movable to cause the knife to commence and cease operation, and means including a hand wheel for moving the back gauge to and from the cutting knife so as to vary the width of the paper which is out by the machine, locking means for the hand wheel comprising a pair of oppositely disposed levers pivoted intermediate their ends and adapted to clamp the wheel between two of their ends, a pair of links each of which is pivoted to the other and to an end of one of the levers to form a toggle joint, an arm connected to one of the levers and swingable to make and breakthe toggle joint to respectively clamp and release the wheel, said arm being positioned relative to the knife control lever so that it cannot be swung to break the: togglejoint when the knife control lever is in knife'operating position.

2. In a paper cutting machine having a cutting knife, a back gauge, knife control means'movable to cause the knife to commence and cease operation, and means including a hand wheel for moving the back gaugeto and from the cutting knife soas to vary. the. width'of. the'paper which is cut by the machine, locking: means .iorvthe hand wheel comprisingapair of oppositely disposed levers pivoted intermediate their ends 4 and adapted to clamp the wheel between two of their ends, a pair of links each of which is pivot ed to the other and to an end of one of the levers to form a toggle joint, an arm connected to one of the levers and'swingable to make and break the toggle joint to respectively clamp and release the wheel, said arm being movable by the knife control means to make the toggle joint when the knife control means is moved ;to.knife operating position.

JOHN KERR.

.REFERENCES CITED 'I'he following references are of record in the fileof this patent:

UNITED STATES PATENTS Marziani Jan. 14, 1947 

